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It had no vacuum bottle, but did have a handle.
The vacuum bottle included in them, however, steadily evolved during the course of the decade and into the 1970s.
During this work he discovered that a welding process he was using could be used to insulate a vacuum bottle with steel instead of glass.
The fluid is drained by gravity, a syringe or by connection to a vacuum bottle.
What was originally a steel vacuum bottle with glass liner, cork or rubber stopper, and bakelite cup became an all-plastic bottle, with insulated foam rather than vacuum.
Feeds should never be kept hot in these vacuum bottles for direct use because of the danger of scalding.
Their use predates the invention of vacuum bottles as a means of keeping hot liquids hot.
